lambdapointer.cpp

class Counter
{
public:
    void count() { counter++; }
    int getCount() { return counter; }
private:
    int counter = 0;
};

static void(*funcptr)(void) = nullptr;
static Counter myCounter;

void interrupt_handler()
{
    if(funcptr != nullptr)
    {
        funcptr();
    }
}

int main()
{
    funcptr = []{ myCounter.count(); };
    interrupt_handler();
}